diff --git a/posts/2016-10-04-pi-pan-tilt-2.md b/posts/2016-10-04-pi-pan-tilt-2.md
index dd3eac3..2cb2db5 100644
--- a/posts/2016-10-04-pi-pan-tilt-2.md
+++ b/posts/2016-10-04-pi-pan-tilt-2.md
@@ -114,7 +114,7 @@ A full-resolution JPEG of the result after automated stitching,
 exposure fusion, lens correction, and so on, is below in this handy
 zoomable viewer using [OpenSeadragon][]:
 
-<div id="openseadragon1" style="width: 800px; height: 600px;"></div>
+<div id="openseadragon1" style="width: 100%; height: 600px;"></div>
 <script src="../js/openseadragon/openseadragon.min.js"></script>
 <script type="text/javascript">
     var viewer = OpenSeadragon({